Compress PDF — Reduce File Size Instantly

Compress any PDF to reduce its file size. See exact reduction percentage before downloading.

Your files never leave your browser. All processing happens locally.

Compression removes redundant cross-reference tables and re-serialises the document structure.

Drop a PDF to compress

or click to browse — max 100 MB

How to Compress a PDF

1
Upload your PDF
Drop your PDF onto the upload zone or click to select the file you want to compress.
2
Click Compress
The tool re-serialises the PDF document structure in your browser to reduce its size.
3
Review the size comparison
See the original size, the compressed size, and the percentage reduction before downloading.
4
Download the compressed file
Click the download button to save the smaller PDF to your device.

Text PDFs vs Scanned PDFs — Compression Expectations

Not all PDFs compress equally. The type of content inside determines how much structural optimization can help:

PDF Type	Content	Typical Original Size (10 pages)	After Compression	Reduction %
Text-Heavy Document	Reports, contracts, essays with minimal images	500 KB - 2 MB	200 KB - 800 KB	30-60%
Business Presentation	Slides with text, charts, and some images	3-8 MB	1.5-4 MB	40-50%
Mixed Content	Text with moderate-quality embedded photos	5-15 MB	3-10 MB	20-40%
Image-Heavy	Product catalogs, photo books, portfolios	20-50 MB	18-45 MB	5-15%
Scanned Document	Full-page scans at 300 DPI (receipts, forms)	15-30 MB	14-28 MB	3-10%

📄 Best Candidates for Compression

Text-heavy documents, business reports, and presentations compress well (30-60% reduction) because most of their size comes from structural overhead, not image data.

🖼️ Limited Compression Potential

Scanned PDFs and photo-heavy documents see minimal reduction (5-15%) because most of their size is raw image data that this tool doesn't re-compress.

🔄 Multiply-Edited Files

PDFs edited by multiple tools (Adobe → Preview → Foxit) accumulate orphaned objects and duplicates. These compress extremely well (50-70%) since most of the bloat is garbage.

PDF Compression Methods — How Different Tools Work

There are three main approaches to PDF compression, each with different trade-offs:

1. Structural Optimization (This Tool)

What it does:

Removes duplicate objects and references
Compresses content streams (text, vectors)
Cleans up orphaned data from previous edits
Rebuilds cross-reference table efficiently

Trade-offs:

✓ Lossless — visual quality unchanged
✓ Safe — no risk of degradation
⚠ Limited — only works on structural bloat
Best reduction: 30-60% on text PDFs

2. Image Downsampling (Lossy)

What it does:

Reduces embedded image resolution (300 DPI → 150 DPI)
Lowers JPEG quality settings (90% → 70%)
Converts color images to grayscale if acceptable
Removes image metadata

Trade-offs:

✗ Lossy — visible quality may degrade
✓ Powerful — can shrink scans 70-90%
⚠ Irreversible — detail is permanently lost
Best reduction: 60-90% on image-heavy PDFs

3. Font Subsetting & Embedding

What it does:

Removes unused font glyphs (only keep A-Z if doc uses A-Z)
Converts embedded fonts to outlines if rarely used
Shares font resources across pages
Replaces similar fonts with system fonts

Trade-offs:

✓ Lossless — text looks identical
⚠ Risky — may break if font missing on reader
⚠ Complex — editing afterward can fail
Best reduction: 10-30% on font-heavy documents

Your Privacy Is Guaranteed

Unlike most online tools, Toolivon processes everything directly in your browser using the Web APIs built into Chrome, Firefox, Safari, and Edge.

✓Your files are never uploaded to any server
✓Nothing is stored after you close the tab
✓No account or email is required
✓Works offline once the page is loaded
✓GDPR-friendly by design — no data leaves your device

Learn how it works →

Your PDF files never leave your device

All processing runs directly in your browser using built-in Web APIs — the Canvas API, Web Audio API, and WebAssembly. Nothing is uploaded to any server. There is no account, no email, and no data retention. You can verify this yourself: open your browser's DevTools Network tab and watch zero outbound file requests while the tool processes your PDF files.

GDPR-friendly · Works offline after page load · No file size limits beyond your device memory

Loading PDF tools…

How to Compress a PDF

Upload your PDF

Drop your PDF onto the upload zone or click to select the file you want to compress.

Click Compress

The tool re-serialises the PDF document structure in your browser to reduce its size.

Review the size comparison

See the original size, the compressed size, and the percentage reduction before downloading.

Download the compressed file

Click the download button to save the smaller PDF to your device.

Text PDFs vs Scanned PDFs — Compression Expectations

Not all PDFs compress equally. The type of content inside determines how much structural optimization can help:

PDF Type	Content	Typical Original Size (10 pages)	After Compression	Reduction %
Text-Heavy Document	Reports, contracts, essays with minimal images	500 KB - 2 MB	200 KB - 800 KB	30-60%
Business Presentation	Slides with text, charts, and some images	3-8 MB	1.5-4 MB	40-50%
Mixed Content	Text with moderate-quality embedded photos	5-15 MB	3-10 MB	20-40%
Image-Heavy	Product catalogs, photo books, portfolios	20-50 MB	18-45 MB	5-15%
Scanned Document	Full-page scans at 300 DPI (receipts, forms)	15-30 MB	14-28 MB	3-10%

📄 Best Candidates for Compression

Text-heavy documents, business reports, and presentations compress well (30-60% reduction) because most of their size comes from structural overhead, not image data.

🖼️ Limited Compression Potential

Scanned PDFs and photo-heavy documents see minimal reduction (5-15%) because most of their size is raw image data that this tool doesn't re-compress.

🔄 Multiply-Edited Files

PDFs edited by multiple tools (Adobe → Preview → Foxit) accumulate orphaned objects and duplicates. These compress extremely well (50-70%) since most of the bloat is garbage.

PDF Compression Methods — How Different Tools Work

There are three main approaches to PDF compression, each with different trade-offs:

1. Structural Optimization (This Tool)

What it does:

Removes duplicate objects and references
Compresses content streams (text, vectors)
Cleans up orphaned data from previous edits
Rebuilds cross-reference table efficiently

Trade-offs:

✓ Lossless — visual quality unchanged
✓ Safe — no risk of degradation
⚠ Limited — only works on structural bloat
Best reduction: 30-60% on text PDFs

2. Image Downsampling (Lossy)

What it does:

Reduces embedded image resolution (300 DPI → 150 DPI)
Lowers JPEG quality settings (90% → 70%)
Converts color images to grayscale if acceptable
Removes image metadata

Trade-offs:

✗ Lossy — visible quality may degrade
✓ Powerful — can shrink scans 70-90%
⚠ Irreversible — detail is permanently lost
Best reduction: 60-90% on image-heavy PDFs

3. Font Subsetting & Embedding

What it does:

Removes unused font glyphs (only keep A-Z if doc uses A-Z)
Converts embedded fonts to outlines if rarely used
Shares font resources across pages
Replaces similar fonts with system fonts

Trade-offs:

✓ Lossless — text looks identical
⚠ Risky — may break if font missing on reader
⚠ Complex — editing afterward can fail
Best reduction: 10-30% on font-heavy documents

Your Privacy Is Guaranteed

Unlike most online tools, Toolivon processes everything directly in your browser using the Web APIs built into Chrome, Firefox, Safari, and Edge.

✓Your files are never uploaded to any server

✓Nothing is stored after you close the tab

✓No account or email is required

✓Works offline once the page is loaded

✓GDPR-friendly by design — no data leaves your device